En suite build.....soil pipe question

Joined
17 Dec 2008
Messages
1,164
Reaction score
53
Location
Nottingham
Country
United Kingdom
Hi all,
building an en suite nex to the existing family bathroom, so hopefully plumbing can tie in with existing water and waste pipes.
The existing toilets soil pipe drops straight down in the cavity wall where the downstairs toilet connects into it too, then (obviously) into the ground to the sewer.
I'm hoping to put the en suite toilet in line with the existing bathroom one and connect the soil pipe into the existing vertical drop. The distance would be about 2.3m.
I'm hoping that this pipe can be boxed in.
Can anyone advise me on the recommended drop for this length please?
And any concerns that connecting a new pipe into the existing may produce or things to watch out for?

The alternative is a saniflow type deal, but i don't like the look of em.

It's possible that we could take the new soil pipe straight outside, then it could drop as much as it wants before coming back into the house to join the existing vertical soil pipe, but that would make the side of the house a little fugly.

Advice would be appreciated, thanks. :)
 
Sponsored Links
Joined
17 Dec 2008
Messages
1,164
Reaction score
53
Location
Nottingham
Country
United Kingdom
Thanks for that indepth explanation :LOL:
Is that for every 40" across you go down 1"? (or whatever measurement)
 
Joined
30 Jul 2006
Messages
3,481
Reaction score
337
Location
Hampshire
Country
United Kingdom
2.5 degrees, 1 in 40 or one inch of fall for every metre horizontally if you will excuse the mixed measurements. Soil pipe bends are usually 87.5 degrees, so the fall is automatically built in.

Bear in mind that you should not make a connection to the soil stack immediately below and opposite the existing tee, otherwise crossflow could become a problem. A connection on the same side or at right angles should be OK.

Avoid a saniflow if at all possible. Working on them when (not if, when) they fail is not a pleasant job.

A seperate soil stack joining the existing drains underground is another possibility
 
Joined
17 Dec 2008
Messages
1,164
Reaction score
53
Location
Nottingham
Country
United Kingdom
2.5 degrees, 1 in 40 or one inch of fall for every metre horizontally if you will excuse the mixed measurements. Soil pipe bends are usually 87.5 degrees, so the fall is automatically built in.
So that's effectively a 2" drop in my case then.

Bear in mind that you should not make a connection to the soil stack immediately below and opposite the existing tee, otherwise crossflow could become a problem. A connection on the same side or at right angles should be OK.
It would be at right angles to the existing one and (obviously) slightly below due to the fall across the 2.3m.

Avoid a saniflow if at all possible. Working on them when (not if, when) they fail is not a pleasant job.
Thanks....will avoid

A seperate soil stack joining the existing drains underground is another possibility
Prefer to avoid this option.
 
Sponsored Links
Top